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Physical Chemistry (PI3 Chemical kinetics)

Quick questions on Chemical Kinetics (PI3) - Eduqas A-Level Chemistry

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is units of kk?
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Work them out each time by rearranging the rate equation; they change with the overall order (for example s−1\text{s}^{-1} for first order, mol−1dm3s−1\text{mol}^{-1}\text{dm}^3\text{s}^{-1} for second).
What is zero-order misread?
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A reactant absent from the rate equation is zero order; its concentration does not affect the rate, which often means it reacts after the rate-determining step.
What is q1?
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State what a constant half-life on a concentration-time graph tells you about the order. [1 mark]
What is q2?
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A reaction has rate =k[A]2= k[\text{A}]^2. Deduce the units of kk if rate is in mol dm−3s−1\text{mol dm}^{-3}\text{s}^{-1}. [1 mark]

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